Diffraction limited beam operation to 0.4W CW output power has been achieved from 20 mu m aperture, 0.98 mu m emitting three core antiresonant reflecting optical waveguide (ARROW)-type InGaAs/InGaAsP/InGaP diode lasers. The central lobe energy content is 73% to 0.2W and 60% at 0.4W.